(FoxNews) – A bag of moon dust from NASA’s Apollo 11 mission – which a woman bought for $995 in 2015 — sold for $1.8 million at a Sotheby’s auction this week following an intense court battle.

The bag, filled with moon dust by astronaut Neil Armstrong during the first manned mission to the moon in July 1969, had previously been misidentified and mistakenly sold at an online government auction.

NASA’s attempt to retrieve the bag failed after a federal judge in December ruled it legally belonged to a Chicago-area woman who bought it two years ago.

The buyer in Tuesday’s auction declined to be identified. The pre-sale estimate was $2 million to $4 million.